Senator Lambie's seat safe

PALMER United's Jacqui Lambie will not lose her Senate seat over a botched election advertisement.

Palmer United Party Senator Jacqui Lambie

Ms Lambie faced potential prosecution and a potential jail term of up to a year over an ad in the Hobart Mercury which apparently breached state law.

The jail term would have ruled her out of taking her Senate spot from July 1.

However, the Tasmanian Electoral Commission has decided not to start legal proceedings.

Instead, it will send letters of caution to Ms Lambie and the publishers of the Hobart Mercury.

Letters of caution over other incidents will be sent to the publishers of the Sunday Tasmanian and Sunday Examiner newspapers Liberal state director Sam McQuestin, PUP Leader Clive Palmer, Australia Post and Right to Life Australia's Margaret Tighe.

Ms Lambie had denied authorising the advertisement in the Hobart Mercury.

The advertisement said it was authorised by her.

The various letters stem from laws making it illegal to print, publish or distribute political advertising or promotional material containing the names or image of candidates without their written consent, during the period between the issue of the writs and the close of the poll.